A method and system for analyzing the overturning stability of the inner tank of a circular liquid storage tank

Abstract

The present invention relates to a method and system for analyzing the overturning stability of an inner tank of a circular liquid storage tank, which is characterized by comprising: obtaining the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank; performing static balance analysis on the inner tank of the circular liquid storage tank to be tested and the liquid in the tank; calculating the overturning stability critical relative acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank according to the static balance analysis result and the structure of the circular liquid storage tank to be tested; judging the overturning state of the inner tank of the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank according to the calculated overturning stability critical relative acceleration and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank, and the present invention can be widely applied to the field of stability analysis.

Description

Technical Field

[0001] The invention relates to the field of stability analysis, and in particular to a method and system for analyzing the overturning stability of an inner tank of a circular liquid storage tank. Background Art

[0002] The inner tank of a circular liquid storage tank contains a large amount of liquid during the operation stage. In earthquake conditions, the internal liquid sloshes due to the horizontal earthquake, which exerts a huge horizontal force on the inner tank. The combined force of the horizontal force acts at a high point, which can easily cause the inner tank to overturn. The overturning instability of the inner tank will cause the bottom of the outer tank of the storage tank to receive a huge uneven load, causing local damage. At the same time, the outer tank wall will also be subjected to a huge horizontal impact force, posing a serious threat to the overall safety and stability of the tank structure.

[0003] In the prior art, the stability analysis of the inner tank of a circular liquid storage tank adopts the theoretical and empirical formulas in foreign standard specifications. However, the formulas in these specifications have certain limitations, and the derivation process is not listed, which makes it difficult to fully guide the construction of storage tanks of different types and volumes. In addition, since the prior art adopts the finite element numerical simulation analysis method, its calculation cost is high and time-consuming, and at the same time, it is impossible to consider the errors and defects caused during the construction process. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide an accurate and efficient method and system for analyzing the overturning stability of the inner tank of a circular liquid storage tank, which can guide the construction of storage tanks of different types and volumes.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, a method for analyzing the overturning stability of an inner tank of a circular liquid storage tank is provided, comprising:

[0006] Obtaining the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank;

[0007] Conduct static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested;

[0008] According to the static balance analysis results and the structure of the circular liquid storage tank to be tested, the critical relative acceleration of the overturning stability of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated;

[0009] According to the calculated critical relative acceleration of overturning stability and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank, the overturning state of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank of the structural system are judged.

[0010] Furthermore, the static balance analysis of the inner tank and the liquid in the circular liquid storage tank to be tested includes:

[0011] The inner tank and the liquid in the circular liquid storage tank to be tested are taken as the mechanical analysis objects, and the bottom of the inner tank is taken as the fixed boundary condition;

[0012] A static equilibrium analysis is performed on the inner tank and the liquid in the circular liquid storage tank to be tested. The relative acceleration is equivalent to the horizontal force on the inner tank and the liquid in the tank, and the overturning moment and resistance moment of the structural system composed of the inner tank and the liquid in the tank are calculated respectively.

[0013] Furthermore, the inner tank overturning state of the structural system composed of the inner tank and the liquid in the tank includes:

[0014] The inner tank is in a critical state of overturning. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is equal to the resistance moment. The structural system is in a state of overturning limit equilibrium. The resistance moment in this state is the resistance moment in the limit equilibrium state.

[0015] The inner tank is in a stable overturning state. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is less than the resistance moment of the limit equilibrium state. The structural system is in a balanced state. The resistance moment of the structural system is the same as the overturning moment, and both are less than the resistance moment of the limit equilibrium state.

[0016] The inner tank is in an overturning and unstable state. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is greater than the resistance moment of the limit equilibrium state. The structural system is in an overturning and unstable state. The resistance moment of the structural system is the same as the overturning moment, and both are greater than the resistance moment of the limit equilibrium state.

[0017] Further, the method of calculating the overturning stability critical relative acceleration of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis result and the structure of the circular liquid storage tank to be tested comprises:

[0018] Establish a polar coordinate system for the bottom of the inner tank of the circular liquid storage tank to be tested;

[0019] Based on the established polar coordinate system, the inner tank bottom of the circular liquid storage tank to be tested is divided into micro units, and the resistance moment acting on each micro unit is determined;

[0020] By double integration and based on the resistance moment acting on each micro-unit, the resistance moment of the limit equilibrium state of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated, and the critical relative acceleration of overturning stability is determined.

[0021] Furthermore, the resistance moment acting on each micro unit is for:

[0022]

[0023] in, is the radius coordinate in the polar coordinate system; is the rotation angle coordinate in the polar coordinate system; is the radius of the inner tank bottom ring plate; is the vertical pressure acting on the micro unit.

[0024] Furthermore, when the relative horizontal acceleration of the structural system is equal to the critical acceleration of overturning stability, the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in a critical state of inner tank overturning;

[0025] When the relative horizontal acceleration of the structural system is less than the critical acceleration of overturning stability, the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in the inner tank overturning stable state;

[0026] When the relative horizontal acceleration to which the structural system is subjected is greater than the critical acceleration of overturning stability, the structural system consisting of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in an inner tank overturning instability state.

[0027] Furthermore, by comparing the acceleration of the liquid in the tank with the calculated critical relative acceleration of overturning stability, it is determined whether the structural system is in an inner tank overturning instability state.

[0028] In a second aspect, a system for analyzing the overturning stability of an inner tank of a circular liquid storage tank is provided, comprising:

[0029] A data acquisition module is used to acquire the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank;

[0030] Static balance analysis module, used to perform static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested;

[0031] A calculation module, which calculates the critical relative acceleration of the overturning stability of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis results and the structure of the circular liquid storage tank to be tested;

[0032] The stability analysis module determines the overturning state of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank of the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank according to the calculated overturning stability critical relative acceleration and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank.

[0033] According to a third aspect, a processing device is provided, comprising computer program instructions, wherein the computer program instructions, when executed by the processing device, are used to implement the steps corresponding to the above-mentioned method for analyzing the overturning stability of the inner tank of a circular liquid storage tank.

[0034] In a fourth aspect, a computer-readable storage medium is provided, on which computer program instructions are stored, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the above-mentioned method for analyzing the overturning stability of the inner tank of a circular liquid storage tank.

[0035] The present invention adopts the above technical solution, which has the following advantages:

[0036] 1. The structural characteristics of the inner tank of a circular liquid storage tank and the stress distribution at the bottom of the tank can be accurately considered during the derivation process of the present invention. The derivation is based on the force and moment balance equation, the principle is clear and can be adjusted and expanded according to different application scenarios.

[0037] 2. The stability analysis result of the present invention is a discriminant formula, which is intuitive and simple, convenient for engineering application, and can be widely used in the overturning stability analysis of circular liquid storage tanks of various types and tank capacities, providing useful guidance and suggestions.

[0038] 3. The present invention is aimed at circular liquid storage tanks and is not affected by the material of the inner tank and the type of liquid contained therein, and has a wide range of applications.

[0039] In summary, the present invention can be widely used in the field of stability analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings:

[0041] Figure 1 A schematic diagram of a method flow chart provided by an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of force analysis of a critical state of overturning of an inner tank provided by an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of force analysis of an inner tank in a stable overturning state provided by an embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of force analysis of an inner tank in an overturned unstable state provided by an embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of double integration of the bottom of a circular inner tank provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0047] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0048] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0049] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0050] The overturning stability analysis method and system of the inner tank of a circular liquid storage tank provided in an embodiment of the present invention adopts equivalent acceleration to simulate the seismic response of the inner tank and the liquid in the circular liquid storage tank to be tested, considers the geometric characteristics and stress distribution characteristics of the bottom of the inner tank of the circular liquid storage tank, establishes a micro-unit static equilibrium equation, and uses double integral to determine the critical equilibrium state of the inner tank of the circular liquid storage tank. The method and system can be widely used in the overturning stability analysis of the inner tank of circular liquid storage tanks of various types and tank capacities, and provide useful guidance and suggestions.

[0051] Example 1

[0052] like Figure 1 As shown, this embodiment provides a method for analyzing the overturning stability of a circular liquid storage tank inner tank, comprising the following steps:

[0053] 1) Obtain the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank and the liquid in the tank.

[0054] Specifically, the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank can be determined through time domain analysis or frequency domain analysis based on relevant information provided in the earthquake safety assessment report.

[0055] 2) Perform static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested, specifically:

[0056] 2.1) The inner tank and the liquid in the circular liquid storage tank to be tested are taken as the mechanical analysis objects, and the bottom of the inner tank is taken as the fixed boundary condition.

[0057] Specifically, it is assumed that the bottom ground boundary condition of the inner tank has finite stiffness, and the bottom of the circular liquid storage tank to be tested is a rigid body that does not deform under stress.

[0058] 2.2) Perform static equilibrium analysis on the inner tank and the liquid in the circular liquid storage tank to be tested, equate the relative acceleration to the horizontal force on the inner tank and the liquid in the tank, and calculate the overturning moment and resistance moment of the structural system composed of the inner tank and the liquid in the tank respectively.

[0059] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, the inner tank overturning state of the structural system composed of the inner tank and the liquid in the tank includes three states: the inner tank overturning critical state, the inner tank overturning stable state and the inner tank overturning instability state, among which:

[0060] ① Critical state of inner tank overturning.

[0061] The overturning moment of the structural system composed of the inner tank and the liquid in the tank in this state Equal to the resistance moment , the structural system is in the overturning limit equilibrium state, and the resistance moment in this state is the limit equilibrium state resistance moment In this state, the reaction force on the bottom of the inner tank from the ground is distributed in a triangular shape, and the reaction force away from the overturning direction of the inner tank is zero:

[0062] (1)

[0063] ② The inner tank is in a stable state of overturning.

[0064] The overturning moment of the structural system composed of the inner tank and the liquid in the tank in this state Less than the limit equilibrium state resistance moment , the structural system is in equilibrium, and the resistance moment of the structural system and overturning moment The same, both less than the resistance moment of the limit equilibrium state In this state, the reaction force on the bottom of the inner tank from the ground is distributed in a trapezoidal shape, and the reaction force away from the overturning direction of the inner tank is the short side of the trapezoid:

[0065] (2)

[0066] ③ The inner tank overturns and becomes unstable.

[0067] The overturning moment of the structural system composed of the inner tank and the liquid in the tank in this state Greater than the limit equilibrium state resistance moment , the structural system is in a state of overturning instability, and the resistance moment of the structural system and overturning moment The same, both greater than the resistance moment of the limit equilibrium state , at this time, the structural system is still under force balance, but only part of the bottom of the inner tank is affected by the ground reaction force, and the reaction force is distributed in a triangular shape, and the reaction force away from the overturning direction of the inner tank is zero:

[0068] (3)

[0069] 3) According to the static balance analysis results and the structure of the circular liquid storage tank to be tested, calculate the critical relative acceleration of the overturning stability of the inner tank and the liquid in the circular liquid storage tank to be tested, specifically:

[0070] 3.1) Establish a polar coordinate system for the bottom of the inner tank of the circular liquid storage tank to be tested.

[0071] 3.2) Based on the established polar coordinate system, the inner tank bottom of the circular liquid storage tank to be tested is divided into micro units, and the resistance moment acting on each micro unit is determined.

[0072] Specifically, the overturning moment of the micro unit is for:

[0073] (4)

[0074] in, is the mass of the liquid in the tank; is the mass of the inner tank body; is the height of the center of mass of the liquid in the tank; is the centroid height of the inner tank body; is the relative horizontal acceleration of the inner tank and the liquid in the tank; and:

[0075] (5)

[0076] in, is the liquid level in the tank.

[0077] Assume that the inner tank has a total wall The center of mass heights are The corresponding masses are , the mass of the bottom plate of the inner tank is ,but:

[0078] (6)

[0079] (7)

[0080] Therefore, the resistance torque acting on each micro-unit is for:

[0081] (8)

[0082] in, is the radius coordinate in the polar coordinate system; is the rotation angle coordinate in the polar coordinate system; is the radius of the inner tank bottom ring plate; is the vertical pressure acting on the micro unit.

[0083] 3.3) Using double integral, based on the resistance moment acting on each micro-unit, the limit equilibrium state resistance moment of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated, and substituted into the moment equilibrium equation to obtain the critical relative acceleration of overturning stability.

[0084] Specifically, Figure 5 As shown, the double integral is established using the polar coordinate system.

[0085] Specifically, when the inner tank overturns in the critical state, double integration is performed within the circular bottom plate of the inner tank to obtain the limit equilibrium state resistance moment of the inner tank and the liquid in the circular liquid storage tank to be tested: :

[0086] (9)

[0087] (10)

[0088] (11)

[0089] (12)

[0090] in, The friction force on the inner tank.

[0091] Specifically, when the horizontal acceleration to which the liquid in the tank is subjected reaches the critical relative acceleration of overturning stability, the system consisting of the inner tank and its internal liquid reaches a critical state, in which the overturning moment of the structural system is equal to the resistance moment to which the structural system is subjected.

[0092] 4) According to the calculated critical relative acceleration of overturning stability and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank, the overturning state of the inner tank of the circular liquid storage tank to be tested and the structural system composed of the inner tank and the liquid in the tank are judged.

[0093] Specifically, when the relative horizontal acceleration in the seismic response acceleration of the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is equal to the critical relative acceleration of overturning stability, the structural system is in a critical state;

[0094] Double integration within the circular bottom plate of the inner tank gives the vertical support force :

[0095] (13)

[0096] (14)

[0097] (15)

[0098] (16)

[0099] In the critical state of overturning stability, for the inner tank structure of the circular liquid storage tank to be tested, the forces in the horizontal and vertical directions are balanced:

[0100] (17)

[0101] (18)

[0102] in, is the critical acceleration for overturning stability; is the friction force on the inner tank; is the vertical seismic acceleration in the seismic response acceleration; is the acceleration due to gravity.

[0103] For the inner tank structure of the circular liquid storage tank to be tested, the moment it is subjected to satisfies:

[0104] (19)

[0105] (20)

[0106] (twenty one)

[0107] In summary, we can get:

[0108] (twenty two)

[0109] (twenty three)

[0110] That is: ① When the relative horizontal acceleration of the structural system is equal to the critical acceleration of overturning stability, that is, when When the inner tank of the circular liquid storage tank to be tested and the structure system composed of the liquid in the tank are in a critical state of inner tank overturning;

[0111] ② When the relative horizontal acceleration of the structural system is less than the critical acceleration of overturning stability, that is, when When the inner tank of the circular liquid storage tank to be tested and the structure system composed of the liquid in the tank are in a stable state of inner tank overturning;

[0112] ③ When the relative horizontal acceleration of the structural system is greater than the critical acceleration of overturning stability, that is, when When the inner tank of the circular liquid storage tank to be tested and the liquid in the tank constitute the structural system, the inner tank is in an unstable state of overturning.

[0113] Specifically, the calculated critical relative acceleration of overturning stability can be used as a criterion. By comparing the acceleration of the liquid in the tank and the critical relative acceleration of overturning stability, it can be determined whether the structural system is in an inner tank overturning instability state.

[0114] Example 2

[0115] This embodiment provides a system for analyzing the overturning stability of a circular liquid storage tank inner tank, comprising:

[0116] The data acquisition module is used to acquire the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank.

[0117] The static balance analysis module is used to perform static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested.

[0118] The calculation module calculates the overturning stability critical relative acceleration of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis results and the structure of the circular liquid storage tank to be tested.

[0119] The stability analysis module determines the overturning state of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank of the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank according to the calculated overturning stability critical relative acceleration and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank.

[0120] Example 3

[0121] This embodiment provides a processing device corresponding to the overturning stability analysis method of the inner tank of a circular liquid storage tank provided in this embodiment 1. The processing device can be a processing device for a client, such as a mobile phone, a laptop computer, a tablet computer, a desktop computer, etc., to execute the method of embodiment 1.

[0122] The processing device includes a processor, a memory, a communication interface and a bus, and the processor, the memory and the communication interface are connected through the bus to complete mutual communication. The memory stores a computer program that can be run on the processing device, and the processing device executes the overturning stability analysis method of the inner tank of a circular liquid storage tank provided in Example 1 when running the computer program.

[0123] In some implementations, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.

[0124] In some other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or other general-purpose processors of various types, which are not limited herein.

[0125] Example 4

[0126] This embodiment provides a computer program product corresponding to the method for analyzing the overturning stability of the inner tank of a circular liquid storage tank provided in this embodiment 1. The computer program product may include a computer-readable storage medium on which computer-readable program instructions for executing the method for analyzing the overturning stability of the inner tank of a circular liquid storage tank described in this embodiment 1 are loaded.

[0127] Computer readable storage media can be tangible devices that hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any combination thereof.

[0128] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A method for analyzing the overturning stability of a circular liquid storage tank inner tank, characterized in that: include: Obtaining the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank; Conduct static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested; According to the static balance analysis results and the structure of the circular liquid storage tank to be tested, the critical relative acceleration of the overturning stability of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated; According to the calculated overturning stability critical relative acceleration and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank, the overturning state of the inner tank of the circular liquid storage tank to be tested and the structural system composed of the inner tank and the liquid in the tank are judged; The method of calculating the overturning stability critical relative acceleration of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis result and the structure of the circular liquid storage tank to be tested comprises: Establish a polar coordinate system for the bottom of the inner tank of the circular liquid storage tank to be tested; Based on the established polar coordinate system, the inner tank bottom of the circular liquid storage tank to be tested is divided into micro units, and the resistance moment acting on each micro unit is determined; By double integration and based on the resistance moment acting on each micro-unit, the resistance moment of the limit equilibrium state of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated, and the critical relative acceleration of overturning stability is determined.

2. The method for analyzing the overturning stability of a circular liquid storage tank inner tank according to claim 1, characterized in that: The static balance analysis of the inner tank and the liquid in the circular liquid storage tank to be tested includes: The inner tank and the liquid in the circular liquid storage tank to be tested are taken as the mechanical analysis objects, and the bottom of the inner tank is taken as the fixed boundary condition; A static equilibrium analysis is performed on the inner tank and the liquid in the circular liquid storage tank to be tested. The relative acceleration is equivalent to the horizontal force on the inner tank and the liquid in the tank, and the overturning moment and resistance moment of the structural system composed of the inner tank and the liquid in the tank are calculated respectively.

3. The method for analyzing the overturning stability of a circular liquid storage tank inner tank according to claim 2, characterized in that: The inner tank overturning state of the structural system composed of the inner tank and the liquid in the tank includes: The inner tank is in a critical state of overturning. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is equal to the resistance moment. The structural system is in a state of overturning limit equilibrium. The resistance moment in this state is the resistance moment in the limit equilibrium state. The inner tank is in a stable overturning state. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is less than the resistance moment of the limit equilibrium state. The structural system is in a balanced state. The resistance moment of the structural system is the same as the overturning moment, and both are less than the resistance moment of the limit equilibrium state. The inner tank is in an overturning and unstable state. In this state, the overturning moment of the structural system composed of the inner tank and the liquid in the tank is greater than the resistance moment of the limit equilibrium state. The structural system is in an overturning and unstable state. The resistance moment of the structural system is the same as the overturning moment, and both are greater than the resistance moment of the limit equilibrium state.

4. The method for analyzing the overturning stability of a circular liquid storage tank inner tank according to claim 1, characterized in that: The resistance moment acting on each micro unit for: in, is the radius coordinate in the polar coordinate system; is the rotation angle coordinate in the polar coordinate system; is the radius of the inner tank bottom ring plate; is the vertical pressure acting on the micro unit.

5. The method for analyzing the overturning stability of a circular liquid storage tank inner tank according to claim 1, characterized in that: When the relative horizontal acceleration of the structural system is equal to the critical acceleration of overturning stability, the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in the critical state of inner tank overturning; When the relative horizontal acceleration of the structural system is less than the critical acceleration of overturning stability, the structural system composed of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in the inner tank overturning stable state; When the relative horizontal acceleration to which the structural system is subjected is greater than the critical acceleration of overturning stability, the structural system consisting of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank is in an inner tank overturning instability state.

6. The method for analyzing the overturning stability of a circular liquid storage tank inner tank according to claim 5, characterized in that: By comparing the acceleration of the liquid in the tank with the calculated critical relative acceleration of overturning stability, it is determined whether the structural system is in an inner tank overturning instability state.

7. A system for analyzing the overturning stability of a circular liquid storage tank inner tank, characterized in that: include: A data acquisition module is used to acquire the structure of the circular liquid storage tank to be tested and the seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank; Static balance analysis module, used to perform static balance analysis on the inner tank and the liquid in the circular liquid storage tank to be tested; A calculation module, which calculates the critical relative acceleration of the overturning stability of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis results and the structure of the circular liquid storage tank to be tested; The stability analysis module determines the overturning state of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank according to the calculated overturning stability critical relative acceleration and the obtained seismic response acceleration of the inner tank of the circular liquid storage tank to be tested and the liquid in the tank; The method of calculating the overturning stability critical relative acceleration of the inner tank and the liquid in the circular liquid storage tank to be tested according to the static balance analysis result and the structure of the circular liquid storage tank to be tested comprises: Establish a polar coordinate system for the bottom of the inner tank of the circular liquid storage tank to be tested; Based on the established polar coordinate system, the inner tank bottom of the circular liquid storage tank to be tested is divided into micro units, and the resistance moment acting on each micro unit is determined; By double integration and based on the resistance moment acting on each micro-unit, the resistance moment of the limit equilibrium state of the inner tank and the liquid in the circular liquid storage tank to be tested is calculated, and the critical relative acceleration of overturning stability is determined.

8. A processing device, characterized in that: It comprises computer program instructions, wherein, when the computer program instructions are executed by a processing device, they are used to implement the steps corresponding to the method for analyzing the overturning stability of the inner tank of a circular liquid storage tank according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the method for analyzing the overturning stability of the inner tank of a circular liquid storage tank according to any one of claims 1 to 6.

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